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- Calculate ΔSsys° (J/K) for the catalytic hydrogenation of acetylene to ethane: C2H2(g) + H2(g) → C2H4(g) Substance S° (J/K·mol) C2H2(g) 200.8 H2(g) 130.58 C2H4(g) 219.4In his classic studies of stereochemistry and optical activity in organic compounds, Pasteur measured the optical activity of many solutions. For the naturally occurring enantiomer of tartaric acid, [α]D20 = +12.4o (c = 20, H2O). What can be concluded about the ratio of tartaric acid enantiomers present in the solution if the observed rotation is (i) α = -6.0o, or (ii) α = 0o?In his classic studies of stereochemistry and optical activity in organic compounds, Pasteur measured the optical activity of many solutions. For the naturally occurring enantiomer of tartaric acid, [α]D20 = +12.4o (c = 20, H2O). What can be concluded about the ratio of tartaric acid enantiomers present in the solution if the observed rotation α = 0o?
- Polypeptides are polymers of amino acids. Suppose that a long polypeptide chain can undergo a transition from a helical conformation to a random coil. Consider a mechanism for a helix–coil transition that begins in the middle of the chain:hhhh…⇌ hchh… hchh… ⇌ cccc… in which h and c label, respectively, an amino acid in a helical or coil part of the chain. The first conversion from h to c, also called a nucleation step, is relatively slow, so neither step may be rate determining. (a) Set up the rate equations for this mechanism. (b) Apply the steady-state approximation and show that, under these circumstances, the mechanism is equivalent to hhhh… ⇌ cccc….I am not sure how they got 10 ns^-1, this is occurring at SATP conditions. .subunit G.H.I please
- Predict the signs of rHo and rSo for the transformation: CH3OH(l) ->CH3OH(g) A.) rHo > 0 and rSo > 0 B) rHo < 0 and rSo > 0 C) rHo > 0 and rSo < 0 D) rHo < 0 and rSo < 0For the reaction 2Na (g) Na2 (g) the following values of K have been determined (C. T. Ewinget al., J. Chem. Phys. 1967, 71, 473):T (K) K900 1.321000 0.471100 0.211200 0.10From these data, estimate rxnH° for the reaction.What is known as Ziegler–Natta catalysts ?
